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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Net Income Per Share |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net loss allocable to common stockholders (in millions) | $ | (24.4 | ) |  | $ | (2.9 | ) |  | $ | (17.8 | ) |  | $ | (17.5 | )
Shares in thousands: |  |  |  |  |  |  |
Average common shares outstanding - basic | 9,077 |  |  | 9,080 |  |  | 9,070 |  |  | 9,071 |
Potentially dilutive shares related to stock options (a) | — |  |  | — |  |  | — |  |  | — |
Average common shares outstanding - diluted | 9,077 |  |  | 9,080 |  |  | 9,070 |  |  | 9,071 |
Net loss per common share – basic and diluted | (2.69 | ) |  | $ | (0.32 | ) |  | $ | (1.96 | ) |  | $ | (1.92 | )
(a) Common stock equivalents excluded from the diluted calculation as a result of a net loss in the period (in thousands) | 56 |  |  | 14 |  |  | 84 |  |  | 7 |
Options outstanding and considered anti-dilutive as their exercise price exceeded the average share market price (in thousands) | 30 |  |  | 375 |  |  | 30 |  |  | 490 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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